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UNI (User Network Interface)

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UNI defines physical and protocol interfacing specifications for devices that are connected at the edges of ATM networks. This includes user systems that are connected to a private ATM switch or the connection between a private ATM switch and an ATM switch owned by a public carrier. The other important ATM interface is NNI (Network-to-Network Interface), which defines interfaces between ATM switches in a core or backbone network. NNI automatically constructs full-mesh PVC connections across the backbone, while UNI allows end systems to establish SVCs across switches in the ATM mesh network.

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